There is a service plan with the following settings:
- Non-zero recurring fee
- Show Zero Price disabled for it
- Some custom Fee Description is set for it
Promotion has the following settings:
- Zero recurring fee
- Show Zero Price is checked
- Fee Description is empty
Subscription was created on such service plan with promotion specified above.
On Billing date no Billing order was generated, but subscription was successfully billed (Next Billing Date of subscription was changed).
Zero Billing order was created instead, because Show Zero Price option from promotion did not affect generation the billing orders. Bug #PBA-56376 was created to fix the issue.
Please enable option Show Zero Price for subscription periods of the service plan.